Book Image

The Handbook of NLP with Gensim

By : Chris Kuo
Book Image

The Handbook of NLP with Gensim

By: Chris Kuo

Overview of this book

Navigating the terrain of NLP research and applying it practically can be a formidable task made easy with The Handbook of NLP with Gensim. This book demystifies NLP and equips you with hands-on strategies spanning healthcare, e-commerce, finance, and more to enable you to leverage Gensim in real-world scenarios. You’ll begin by exploring motives and techniques for extracting text information like bag-of-words, TF-IDF, and word embeddings. This book will then guide you on topic modeling using methods such as Latent Semantic Analysis (LSA) for dimensionality reduction and discovering latent semantic relationships in text data, Latent Dirichlet Allocation (LDA) for probabilistic topic modeling, and Ensemble LDA to enhance topic modeling stability and accuracy. Next, you’ll learn text summarization techniques with Word2Vec and Doc2Vec to build the modeling pipeline and optimize models using hyperparameters. As you get acquainted with practical applications in various industries, this book will inspire you to design innovative projects. Alongside topic modeling, you’ll also explore named entity handling and NER tools, modeling procedures, and tools for effective topic modeling applications. By the end of this book, you’ll have mastered the techniques essential to create applications with Gensim and integrate NLP into your business processes.
Table of Contents (24 chapters)
1
Part 1: NLP Basics
5
Part 2: Latent Semantic Analysis/Latent Semantic Indexing
9
Part 3: Word2Vec and Doc2Vec
12
Part 4: Topic Modeling with Latent Dirichlet Allocation
18
Part 5: Comparison and Applications

Using TruncatedSVD for LSI with real data

In this section, we will build a model using TruncatedSVD and real data. Let me outline the tasks first. This task list is a general procedure when you build an LSI:

  • Loading the data
  • Creating TF-IDF
  • Using TruncatedSVD to build a model
  • Interpreting the outcome

For an effective learning outcome, we will just use five documents in the data so we can print out the words. Once you know how the process works, you can replicate it for the entire data.

Loading the data

In the Preface of the book, we said that we will use the sampled AG corpus of news articles throughout the book. Using one dataset will help you to focus on the techniques rather than orient yourself to different data, although there is still some value in exposing it to different datasets. The original AG corpus of news articles is a large collection of more than 1 million news articles from more than 2,000 news sources. A smaller collection that sampled...